$\left(6x\right)+\left(10y\right)+4z+\left(-10y\right)$

$\lim_{x\to\infty}\left(1+\frac{-1}{x}\right)^{0.3x}$

$\lim_{x\to\infty}\left(x-\left(\left(x\right)\cdot e^{-\frac{1}{x}}\right)+e^{-\frac{1}{x}}\right)$

$a+b-c+a+b-c+2a+b+c$

$3m-6mn-4m-8n$

$-10x+10xyz+8y+2y+7x+z$

$\left(x^3y^2z+7x^2y\right)\left(x^3y^2z-7x^2y\right)$